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confighelper.js
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confighelper.js
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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
var config;
function Config(xhr) {
function loadPreferences(xhr) {
var parser = new DOMParser();
var doc = parser.parseFromString(xhr.responseText, "application/xml");
var preferences = doc.getElementsByTagName("preference");
return Array.prototype.slice.call(preferences);
}
this.xhr = xhr;
this.preferences = loadPreferences(this.xhr);
}
function readConfig(success, error) {
var xhr;
if(typeof config != 'undefined') {
success(config);
}
function fail(msg) {
console.error(msg);
if(error) {
error(msg);
}
}
var xhrStatusChangeHandler = function() {
if (xhr.readyState == 4) {
if (xhr.status == 200 || xhr.status == 304 || xhr.status === 0 /* file:// */) {
config = new Config(xhr);
success(config);
}
else {
fail('[Browser][cordova.js][xhrStatusChangeHandler] Could not XHR config.xml: ' + xhr.statusText);
}
}
};
if ("ActiveXObject" in window) {
// Needed for XHR-ing via file:// protocol in IE
xhr = new window.ActiveXObject("MSXML2.XMLHTTP");
xhr.onreadystatechange = xhrStatusChangeHandler;
} else {
xhr = new XMLHttpRequest();
xhr.addEventListener("load", xhrStatusChangeHandler);
}
try {
xhr.open("get", "/config.xml", true);
xhr.send();
} catch(e) {
fail('[Browser][cordova.js][readConfig] Could not XHR config.xml: ' + JSON.stringify(e));
}
}
/**
* Reads a preference value from config.xml.
* Returns preference value or undefined if it does not exist.
* @param {String} preferenceName Preference name to read */
Config.prototype.getPreferenceValue = function getPreferenceValue(preferenceName) {
var preferenceItem = this.preferences && this.preferences.filter(function(item) {
return item.attributes.name && item.attributes.name.value === preferenceName;
});
if(preferenceItem && preferenceItem[0] && preferenceItem[0].attributes && preferenceItem[0].attributes.value) {
return preferenceItem[0].attributes.value.value;
}
};
exports.readConfig = readConfig;